Perhaps you should try some spelling variations:
"coder coder convex optimization problem" » "coder coder convex optimization problems" (Expand search), "coder closed convex optimization problem" (Expand search), "coder or convex optimization problem" (Expand search), "coder some convex optimization problem" (Expand search), "coder decoder convex optimization problem" (Expand search), "code code convex optimization problem" (Expand search), "decoder codec convex optimization problem" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa python python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder convex optimization problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder convex optimization problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder convex optimization problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder convex optimization problem") OR ("api python python python programming"))*.